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arXiv 1202.5520hep-ex
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用ATLAS探测器寻找sqrt(s)= 7 TeV pp碰撞中的同号顶夸克产生和第四代下型夸克

Search for same-sign top-quark production and fourth-generation down-type quarks in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector

ATLAS Collaboration

摘要:

本文研究了两个孤立的具有相同电荷的轻子(电子或μ子),至少有两个喷注和大的丢失横动量的事件中,同号顶夸克产生和电荷为-1/3的下型重夸克.这些数据是从ATLAS探测器记录的sqrt(s)=7 TeV的pp碰撞中选择的,对应于1.04逆毫微微巴恩斯的积分亮度。观察到的数据与标准模型过程的预期一致。上限设定在95%的置信水平上的截面的新的源的同号顶夸克对生产的1.4-2.0铅取决于假定的介质质量。对于新的重降型夸克,对产生截面也设定了上限;在假设重降型夸克100%衰变到Wt的情况下,在95%的置信水平下,对重降型夸克的质量设定了450 GeV的下限。

英文摘要:

A search is presented for same-sign top-quark production and down-type heavy quarks of charge -1/3 in events with two isolated leptons (electrons or muons) that have the same electric charge, at least two jets and large missing transverse momentum. The data are selected from pp collisions at sqrt(s)=7 TeV recorded by the ATLAS detector and correspond to an integrated luminosity of 1.04 inverse femtobarns. The observed data are consistent with expectations from Standard Model processes. Upper limits are set at 95% confidence level on the cross section of new sources of same-sign top-quark pair production of 1.4-2.0 pb depending on the assumed mediator mass. Upper limits are also set on the pair-production cross-section for new heavy down-type quarks; a lower limit of 450 GeV is set at 95% confidence level on the mass of heavy down-type quarks under the assumption that they decay 100% of the time to Wt.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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